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Phrase(s): flat on one’s ass
1. Fig. Inf. completely exhausted. (Potentially offensive. Use only with discretion.) • I’m just flat on my ass. I need some rest. • After the day of the marathon, Pete was flat on his ass for a week. 2. Fig. Inf. broke; financially destroyed. (Potentially offensive. Use only with discretion. An elaboration of flat broke.) • Sorry, I can’t help you. I’m broke—flat on my ass. • The guy’s flat on his ass. Can you help him out with a loan?
McGrawhill's American Idioms And Phrasal Verbs